/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */


/*
 * Copyright 1999-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: LocaleUtility.java,v 1.2.4.1 2005/09/15 08:15:47 suresh_emailid Exp $
 */

package com.sun.org.apache.xml.internal.utils;

import java.util.Locale;

/**
 * @author Igor Hersht, igorh@ca.ibm.com
 */
public class LocaleUtility {

  /**
   * IETF RFC 1766 tag separator
   */
  public final static char IETF_SEPARATOR = '-';
  public final static String EMPTY_STRING = "";


  public static Locale langToLocale(String lang) {
    if ((lang == null) || lang.equals(EMPTY_STRING)) { // not specified => getDefault
      return Locale.getDefault();
    }
    String language = EMPTY_STRING;
    String country = EMPTY_STRING;
    String variant = EMPTY_STRING;

    int i1 = lang.indexOf(IETF_SEPARATOR);
    if (i1 < 0) {
      language = lang;
    } else {
      language = lang.substring(0, i1);
      ++i1;
      int i2 = lang.indexOf(IETF_SEPARATOR, i1);
      if (i2 < 0) {
        country = lang.substring(i1);
      } else {
        country = lang.substring(i1, i2);
        variant = lang.substring(i2 + 1);
      }
    }

    if (language.length() == 2) {
      language = language.toLowerCase();
    } else {
      language = EMPTY_STRING;
    }

    if (country.length() == 2) {
      country = country.toUpperCase();
    } else {
      country = EMPTY_STRING;
    }

    if ((variant.length() > 0) &&
        ((language.length() == 2) || (country.length() == 2))) {
      variant = variant.toUpperCase();
    } else {
      variant = EMPTY_STRING;
    }

    return new Locale(language, country, variant);
  }


}
